Because of his name and heritage, there were immediate questions about Mateen's possible ties to Islamic fundamentalism — but his father said it may have been a recent incident involving two men showing each other affection that set the gunman off.

"We were in Downtown Miami, Bayside, people were playing music. And he saw two men kissing each other in front of his wife and kid and he got very angry," Mir Seddique, told NBC News on Sunday. "They were kissing each other and touching each other and he said, 'Look at that. In front of my son they are doing that.' And then we were in the men's bathroom and men were kissing each other."

"We are saying we are apologizing for the whole incident," Seddique said. "We weren't aware of any action he is taking. We are in shock like the whole country."